While I can understand the technological breakthrough of a bendy phone or reader, I just don't understand the reason for its use ?
What would you need to spend your days bending a reader for, maybe to release your stress ?

The size when not in use would be small enough that you could always have it with you. You could have a phone that expands to the size of a tablet when needed. Or you could have phone built into a bracelet. Or an errader in a pen!

Of course, for now, manufacturers focus more on producing custom shapes (wrap-around screens) and making their devices less accident prone, like was mentioned higher above.